Original title: Temperature Inversion and Heat Transport Against the Temperature Drop in Two-Phase Convection of Cryogenic Helium
Authors: Urban, Pavel ; Schmoranzer, D. ; Hanzelka, Pavel ; Skrbek, L.
Document type: Papers
Conference/Event: Cryogenics 2014. The IIR International Conference /13./, Praha (CZ), 2014-04-07 / 2014-04-11
Year: 2014
Language: eng
Abstract: In the system of two bodies A and B connected by a two-phase vapour-liquid system consisting only of cryogenic helium, we observed anomalous heat transport from the colder but heated body B to the warmer but cooled body A. We noticed this effect during the process of liquid evaporation inside a cylindrical pressure convection cell used for study of Rayleigh-Bénard convection. This anomalous heat transfer occurs under non-equilibrium conditions, owing to the phase transitions that take place inside the cell while temperature inversion develops between the heated but cooler bottom plate and the cooled but warmer top plate. This process is, by virtue of the system being open with respect to heat transport, in no contradiction to the second law of thermodynamics, and a numerical model was formulated that describes the observations with good agreement.
Keywords: cryogenic helium; Cryogenics; rain formation; temperature inversion; two-phase convection
Project no.: GPP203/12/P897 (CEP), LO1212 (CEP), ED0017/01/01
Funding provider: GA ČR, GA MŠk, GA MŠk
Host item entry: Cryogenics 2014. The 13th IIR International Conference Proceedings, ISBN 978-2-36215-002-9, ISSN 0151-1637

Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0238154

Permalink: http://www.nusl.cz/ntk/nusl-177519


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